Jamb Chemistry Past Questions and Answers

Question 1751:

• JAMB 2014

Water is said to be temporarily hard when it contains

A. Ca (HCO₃)₂ and Mg (HCO₃)₂ salts
B. Ca (HCO₃)₂ and CaCO₃ SALTS
C. Mg(HCO₃)₂ and CaSO₄ salts
D. CaSO₄ and Ca(HCO₃)₂ salts

Question 1752:

• JAMB 2014

On exposure to the atmosphere, a hydrated salt loses its water of crystallization to become anhydrous. This phenomenon is referred to as

A. Efflorescence
B. Diliquescence
C. Hygroscopy
D. Hydrolysis

Question 1753:

• JAMB 2014

16.55g of lead (ll) trioxonitrate (V) was dissolved in 100g of distilled water at 20oC, calculate the solubility of the solute in moldm-3
[Pb = 207, N = 14, O = 16]

A. 0.05 g
B. 2.00 g
C. 1.00 g
D. 0.50g

Question 1754:

• JAMB 2014

The dispersion of a liquid in a liquid medium will give

A. An emulsion
B. A fog
C. A gel
D. An aerosol

Question 1755:

• JAMB 2014

The major and most effective way of controlling pollution is to

A. Improve machinery so that the substances released from combustion are less harmful
B. Pass strict laws against it by individuals and companies
C. Educate people on the causes and effects of pollution
D. Convert chemical wastes to harmless substances before releasing them into the environment